Year	Percent
1998-01-01	11.20000
1999-01-01	11.20000
2000-01-01	10.60000
2001-01-01	10.60000
2002-01-01	10.60000
2003-01-01	10.60000
2004-01-01	10.60000
2005-01-01	10.60000
2006-01-01	4.00000
2007-01-01	3.10000
2008-01-01	4.30000
2009-01-01	4.70000
2010-01-01	3.66355
2011-01-01	2.93742
2012-01-01	3.28720
2013-01-01	3.39336
2014-01-01	3.27080
2015-01-01	3.05632
2016-01-01	2.92120